① The selection should be based on the working conditions and the type of flange sealing surface.
② When selecting products from production enterprises with a sound quality management system and effective operation, it is also necessary to check whether the products have manufacturing licenses and valid special equipment type test reports.
③ The surface of the metal ring gasket should be free of scratches, rust spots, gaps, and uneven surface defects. The non-metallic strips on the gasket surface should be uniform and appropriately higher than the metal strips, with clear interlayer textures but the metal strips should not be exposed.
④ The spacing between gasket solder joints should be uniform, without defects such as incomplete fusion or excessive fusion.
⑤ The surface of the reinforcing ring should be free of burrs, rust spots, unevenness, and other defects.
⑥ The distance between the upper and lower sealing surfaces of the gasket body and the upper and lower surfaces of the reinforcing ring should be equal.
⑦ The inner reinforcement ring and gasket body should be firmly fixed without looseness, and the outer reinforcement ring should be positioned together with the gasket body and appropriately loosened.
⑧ Compression rate, rebound rate, and sealing performance are important performance indicators of sealing gaskets. Generally speaking, the higher the rebound rate, the better. On the premise of meeting the rebound rate standard requirements, the compression rate test value is also good.
Products with good sealing performance, moderate compression rate, and high rebound rate should be selected.